, where president obama and mitt romney are getting set for their first debate tonight. good evening, i'm judy woodruff. >> ifill: and i'm gwen ifill. on the "newshour" tonight, we get some pre-game analysis from mark shields and david brooks. >> woodruff: then, from loose seats to smoky cabins and labor woes, we get the latest on troubles at american airlines. >> ifill: jeffrey brown updates the story of the butler accused of stealing documents from the pope and leaking them to the press. >> woodruff: hari sreenivasan travels to the electorally important swing state of iowa where the polls opened last week. >> a recent des moines register poll found less than 2% of iowa voters were undecided, which means the campaigns could benefit from locking in votes early. >> ifill: margaret warner examines a genetic breakthrough that could allow doctors to diagnose and treat seriously ill infants sooner. >> woodruff: and we close by returning to a conversation with tonight's debate moderator, our own jim lehrer about his book on past presidential debates. that's all ahead on tonigh